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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Administrative data

Endpoint:
biodegradation in water and sediment: simulation tests
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)

Data source

Reference
Reference Type:
other: Prediction model
Title:
Biodegradation in water and sediment by Environmental Science Center’s PBT profiler
Author:
Environmental Science Center
Year:
2010
Bibliographic source:
PBT profiler, Office of Chemical Safety and Pollution Prevention , U.S. Environmental Protection Agency; version 1.301

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: Modelling database
Principles of method if other than guideline:
PBT profiler database
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
4-nitro-o-xylene
EC Number:
202-761-6
EC Name:
4-nitro-o-xylene
Cas Number:
99-51-4
Molecular formula:
C8H9NO2
IUPAC Name:
4-nitro-o-xylene
Details on test material:
Substance Name : 4-nitro-o-xylene
Molecular Formula : C8H9NO2
Physical state : Liquid
Radiolabelling:
not specified

Study design

Oxygen conditions:
other: Estimation
Inoculum or test system:
not specified
Parameter followed for biodegradation estimation:
test mat. analysis
Reference substance
Reference substance:
not specified

Results and discussion

Mean total recoveryopen allclose all
Compartment:
other: water, material (mass) balance
% Recovery:
19
Compartment:
other: sediment, material (mass) balance
% Recovery:
0
% Degradationopen allclose all
% Degr.:
50
Parameter:
other: Half life
Sampling time:
38 d
% Degr.:
50
Parameter:
other: Half life
Sampling time:
340 d
Half-life of parent compound / 50% disappearance time (DT50)open allclose all
Compartment:
water
DT50:
38 d
Type:
other: Estimated
Remarks on result:
other: Other details not available
Compartment:
sediment
DT50:
340 d
Type:
other: Estimated
Remarks on result:
other: Other details not available
Transformation products:
not specified

Applicant's summary and conclusion

Conclusions:
Half life period of 4-nitro-o-xylene in water observed 38 days (half-life) while in sediment it is 340 days (half-life). Based on these half life values, it is concluded that 4-nitro-o-xylene is readily biodegradable in water where as it is not likely to biodegrade in sediment.

Executive summary:

Half life period of 4-nitro-o-xylene in water observed 38 days (half-life) while in sediment it is 340 days (half-life). Based on these half life values, it is concluded that 4-nitro-o-xylene is readily biodegradable in water where as it is not likely to biodegrade in sediment.

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